Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3878aad0878bb8…

MALICIOUS

PDF

36.6 KB Created: 2020-06-03 22:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7c3f419ea7f2c394cfb645c2dbd4b2d8 SHA-1: c69173696c862edee447066a712846a2abc2a0e8 SHA-256: 4f3878aad0878bb821772836068489552349f1309cc0008fc6a7b1303698fa70
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. The document body, though malformed, suggests a lure related to 'free printable worksheets for kids learning english'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, likely to pages designed to manipulate search engine rankings or host further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wangluozhenqianduboyouxi.jhamrick.com/uploads/1/3/0/2/130289625/130289625.html#free+printable+worksheets+for+kids+learning+english PDF link annotation
    • http://ketchdoom.com/uploads/1/3/0/4/130478307/2395293a.pdfIn PDF document text
    • http://naptownlimos.com/uploads/1/3/0/5/130588937/bivaxakewoluv-nonuvuluxiwixo.pdfIn PDF document text
    • http://visionlampasas.com/uploads/1/3/1/8/131856726/xanubolirodaxonaxa.pdfIn PDF document text
    • http://dominantbabygirl.com/uploads/1/3/0/8/130814024/romumarosakapunugub.pdfIn PDF document text
    • http://scarlettsbowcompany.net/uploads/1/3/0/6/130604241/xilixujiro-pibeletix.pdfIn PDF document text
    • http://mta-sts.mail.ginnybarnettephotography.com/uploads/1/3/0/6/130620791/49b916ce56.pdfIn PDF document text
    • http://hoptransport.com/uploads/1/3/0/8/130873822/9943767.pdfIn PDF document text
    • http://jacksonhole-rentals.com/uploads/1/3/0/9/130969774/zeduxakuj.pdfIn PDF document text
    • http://miissb.org/uploads/1/3/0/6/130621871/novaji.pdfIn PDF document text
    • http://wangluozhenqianduboyouxi.jhamrick.com/uploads/1/3/0/2/130289625/terms.htmlIn PDF document text
    • http://wangluozhenqianduboyouxi.jhamrick.com/uploads/1/3/0/2/130289625/dmca.htmlIn PDF document text
    • http://wangluozhenqianduboyouxi.jhamrick.com/uploads/1/3/0/2/130289625/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dotuwapifufe.files.wordpress.com/2020/06/51635053152.pdfIn PDF document text
    • https://vesuduk333682907.files.wordpress.com/2020/06/labasuximugibidogojunas.pdfIn PDF document text
    • https://pojipipa.files.wordpress.com/2020/06/48251182719.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000627e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627E 10464 bytes
SHA-256: 9327a6f88c84f365956936f9070cae75c07d7f2bddf8c56b1ecd7ce757765bad

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